XML 46 R33.htm IDEA: XBRL DOCUMENT v3.10.0.1

Debt - Summary of Scheduled Debt Maturities, Including Balloon Payments (Parenthetical) (Detail)		6 Months Ended
	Jun. 02, 2015	Jun. 30, 2018
Debt Instrument [Line Items]
Revolving facility optional extension period	1 year
Revolving Facility [Member]
Debt Instrument [Line Items]
Credit facility agreement, maturity date		Mar. 23, 2022
Revolving facility optional extension period		1 year
Credit facility agreement, optional extended maturity date		Mar. 31, 2023

X

- Definition

Line of credit facility optional extended maturity date.

+ References

No definition available.

+ Details

Name:	gty_LineOfCreditFacilityOptionalExtendedMaturityDate
Namespace Prefix:	gty_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The length of time the Revolving Facility may be extended.

+ References

No definition available.

+ Details

Name:	gty_RevolvingFacilityOptionalExtensionPeriod
Namespace Prefix:	gty_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: